Meaning of “have your finger on the trigger” in the English Dictionary

british dictionary

"have your finger on the trigger" in British English

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have your finger on the trigger

used to say that someone is ready and prepared to do something, especially something violent:

They have their finger on the trigger to start a nuclear war.

(Definition of “have your finger on the trigger” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)